Facebook unveiled a new dating feature — a surprise announcement that sent shares of Match Group, the company that owns Tinder and OkCupid, plunging 22 percent.

“This is going to be for building real, long-term relationships — not just for hookups,” Zuckerberg told the crowd at the social network’s annual F8 developer conference on Tuesday.

Chief Executive Zuckerberg said Facebook designed the new feature “with privacy and safety in mind,” adding that users’ friends on the social network won’t see that they’re using it.

Nevertheless, competitors seized on Facebook’s recent scandals over data leaks and fake news to poke fun at the initiative.

“Their product could be great for US-Russia relationships,” said Joey Levin, CEO of Match Group majority owner IAC — which saw its shares plummet nearly 18 percent Tuesday, to $133.33.

“Come on in. The water’s warm,” Levin said.

Facebook said its dating feature will only display profiles of users who are not friends on the social network. Instead, the new feature will allow users to connect through shared interests or events they plan to attend.

“It mirrors the way people actually date, which is usually at events and institutions that they’re connected to,” Chief Product Officer Chris Cox said.

The dating feature will be built in to the main Facebook app, but will be optional, Zuckerberg said. Users who opt in will be able to build profiles similar to those on popular apps like Tinder and Bumble.

Facebook has long allowed users to display their relationship status on their profiles. Zuckerberg said that introducing a functionality to link single users is a logical next step.

“There are 200 million people on Facebook who list themselves as single,” he said. ”Clearly there’s something to do here.”

Separately, on Tuesday, British Parliament again demanded that Zuckerberg come to London to answer questions about the Cambridge Analytica scandal, and threatened him with a formal summons to force him to appear the next time he sets foot in the country.